A supplementary device for attachment to a drug delivery device, a number sleeve for a drug delivery device, and a drug delivery device

ABSTRACT

A supplementary device for attachment to a drug delivery device is provided. The device includes an attachment mechanism for coupling the supplementary device to the drug delivery device, an imaging arrangement for providing image data representing a captured image of one or more numbers present on a number sleeve of the drug delivery device and a processor arrangement. The processor arrangement is configured to receive the image data; perform optical character recognition on the image data to determine a quantity of a currently set dose of medicament; cause display of the quantity of the currently set dose; process the image data to identify one or more characteristics of the number sleeve; determine from the identified characteristics whether the currently set dose is a permitted dose; and if the currently set dose is not a permitted dose, cause an indication that the currently set dose is not a permitted dose.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is the national stage entry of InternationalPatent Application No. PCT/EP2017/062645, filed on May 24, 2017, andclaims priority to Application No. EP 16171083.5, filed in on May 24,2016, the disclosures of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a supplementary device for attachmentto a drug delivery device, wherein the supplementary device comprises animaging arrangement and a processor arrangement configured to calculatea quantity of a currently set dose of medicament. The present disclosurerelates also to a number sleeve for a drug delivery device and to a drugdelivery device including such.

BACKGROUND

A variety of diseases exists that require regular treatment by injectionof a medicament. Such injection can be performed by using injectiondevices, which are applied either by medical personnel or by patientsthemselves. As an example, type-1 and type-2 diabetes can be treated bypatients themselves by injection of insulin doses, for example once orseveral times per day. For instance, a pre-filled disposable insulin pencan be used as an injection device. Alternatively, a re-usable pen maybe used. A re-usable pen allows replacement of an empty drug ormedicament cartridge by a new one. Either pen may come with a set ofone-way needles that are replaced before each use. The insulin dose tobe injected can then for instance be manually selected at the insulinpen by turning a dosage knob and observing the set dose shown on part ofa number sleeve that is visible through a dose window of the insulinpen. In other cases, the set dose is show on an electronic display ofthe insulin pen. The dose is then injected by inserting the needle intoa suitable skin portion and pressing an injection button of the insulinpen.

To be able to monitor insulin injection, for instance to prevent falsehandling of the insulin pen or to keep track of the doses alreadyapplied, it is desirable to measure information related to a conditionand/or use of the injection device, such as for instance information onthe injected insulin type and dose.

SUMMARY

At least one aspect of the present disclosure provides a supplementarydevice for attachment to a drug delivery device. The supplementarydevice includes an attachment mechanism for coupling the supplementarydevice to the drug delivery device; an imaging arrangement configured toprovide image data representing a captured image of one or more numberspresent on a number sleeve of the drug delivery device at a location onthe number sleeve corresponding to a currently set dose of medicament;and a processor arrangement. The processor arrangement is configured to:receive the image data representing the captured image; perform opticalcharacter recognition on the image data to determine a quantity of thecurrently set dose of medicament; cause display of the quantity of thecurrently set dose of medicament; process the image data representingthe captured image to identify one or more characteristics of the numbersleeve at the location; determine from the determined characteristics ofthe number sleeve whether the currently set dose of drug is a permitteddose; and in response to determining that the currently set dose of drugis not a permitted dose, cause an indication that the currently set doseof drug is not a permitted dose to be provided.

This supplementary device may allow a user easily to identify whether acurrently set dose is a dose that is permitted for the user, even ifthey are unable to determine that information directly from the drugdelivery device. This can improve usablility, and also safety, for theuser. Moreover, this can be achieved in an intuitive way, according tovarious optional features which are described below.

The processor arrangement may be configured to process the image datarepresenting the captured image to identify one or more characteristicsof the number sleeve at the location by determining a colour of thebackground of the number sleeve at the location.

The processor arrangement may be configured to process the image datarepresenting the captured image to identify one or more characteristicsof the number sleeve at the location by determining a colour of thenumbers on the number sleeve at the location.

The processor arrangement may be configured to determine from thedetermined characteristics of the number sleeve whether the currentlyset dose of drug is a permitted dose by determining whether thecharacteristics of the number sleeve at the location are light colourednumbers on a dark coloured background.

The processor arrangement may be configured to determine from thedetermined characteristics of the number sleeve whether the currentlyset dose of drug is a permitted dose by determining whether thecharacteristics of the number sleeve at the location are dark colourednumbers on a light coloured background.

The processor arrangement may be configured to cause the indication thatthe currently set dose of drug is not a permitted dose to be provided bycausing display of a message.

The processor arrangement may be configured to cause the indication thatthe currently set dose of drug is not a permitted dose to be provided bycausing display of a message simultaneously with causing display of thequantity of the currently set dose of medicament.

The processor arrangement may be configured to cause the indication thatthe currently set dose of drug is not a permitted dose to be provided bycausing display of a message alternately with causing display of thequantity of the currently set dose of medicament.

The processor arrangement may be configured to cause the indication thatthe currently set dose of drug is not a permitted dose to be provided bycausing illumination of an LED or other optical transducer.

The processor arrangement may be configured, in response to determiningthat the currently set dose of drug is not a permitted dose, to actuatea locking arrangement to prevent drug delivery.

Certain aspects of the present disclosure provides a system comprisingthe supplementary device above and a drug delivery device having anumber sleeve with numbers provided thereon.

Certain aspects of the present disclosure provides a number sleeve for adrug administration device, the number sleeve comprising a generallycylindrical outer surface on which are provided a sequence of numbersarranged at different locations on the surface with the sequenceprovided in a helix, each of the numbers relating to a drug dose, wherethe surface at locations corresponding to doses within a specific doserange has different characteristics to the surface at locationscorresponding to doses that are outside of the specific dose range.

Through these features, a supplementary device may be able to determinefrom viewing the number sleeve not only a currently dialled or set dosebut also whether the currently dialled or set dose is one that ispermitted to be delivered to the user. This does not require thesupplementary device to be pre-programmed with information relating topermitted dose sizes for the user. Also through these features, a usermay be able to determine from observing a drug delivery device includingthe number sleeve not only a currently set or dialled dose but andwhether the set or dialled dose is within a range of doses that arepermitted for the user by their drug administration plan or regime.

The different characteristics may be different colours for the numberson the surface of the number sleeve.

The different characteristics may be different colours for a backgroundto the numbers on the surface of the number sleeve.

The different colours may be detectable by the human eye.

The surface at locations corresponding to doses within the specificrange may indicate the dose as a number that is coloured black on awhite background, and the surface at locations corresponding to dosesoutside the specific range may indicate the dose as a number that iscoloured white on a black background.

Another aspect of the disclosure provides a drug delivery deviceincluding the number sleeve above.

BRIEF DESCRIPTION OF THE FIGURES

Embodiments of the disclosure will now be described, by way of example,with reference to the accompanying drawings, in which:

FIG. 1a is an exploded view of an drug delivery device according toexemplary embodiments;

FIG. 1b is a perspective view of some detail of the drug delivery deviceof FIG. 1 a;

FIG. 2a is a schematic illustration of a supplementary device accordingto exemplary embodiments that can be releasably attached to the drugdelivery device of FIGS. 1a and 1 b;

FIG. 2b is an isometric view of another supplementary device accordingto exemplary embodiments that can be releasably attached to the drugdelivery device of FIGS. 1a and 1 b;

FIG. 2c is an isometric view of yet another supplementary deviceaccording to exemplary embodiments that can be releasably attached tothe drug delivery device of FIGS. 1a and 1 b;

FIG. 3 is a schematic view of the FIGS. 2c, 2b and 2c supplementarydevices attached to a drug delivery device according to exemplaryembodiments and showing components of the supplementary device;

FIG. 4 is a flowchart illustrating exemplary operation of thesupplementary device according to exemplary embodiments;

FIGS. 5A and 5B are views of a drug delivery device according toexemplary embodiments showing the number sleeve at different dialleddoses;

FIG. 6 is a view of a different drug delivery device according toexemplary embodiments showing the number sleeve according to exemplaryembodiments at a certain dialled dose;

FIG. 7 is a view of a number sleeve according to exemplary embodimentsthat forms part of the the drug delivery device of FIGS. 1a and 1b ; and

FIG. 8 is a view of another number sleeve according to exemplaryembodiments that forms part of the the drug delivery device of FIGS. 1aand 1 b.

DETAILED DESCRIPTION

In brief, the disclosure describes a supplementary device (alternativelyknown as a companion device, a clip-on device or a sensor device) thatis operable with drug delivery device, e.g. an injection device, such asa pen injector. The supplementary device is configured to view a numbersleeve of the drug delivery device and determine therefrom a set drugdose, and also a delivered dose. The supplementary device is configuredalso to detect from the number sleeve whether a currently dialled doseis a dose that is indicated by the drug delivery device to be apermitted dose. This is indicated by the number sleeve of the drugdelivery device, and not by the numbers that are present on the numbersleeve at a location that is being viewed but by some other opticalcharacteristic of the number sleeve. In some embodiments, the currentlyset dose being a permitted dose is indicated by the numbers beingprovided as black numerals on a white background and the currently setdose not being a permitted dose is indicated by the numbers beingprovided as white numerals on a black background. The supplementarydevice is configured to respond to a detection of a currently set dosenot being a permitted dose by providing an indication to a user, forinstance in the form of a message. The supplementary device may also actto prevent drug delivery unless the set dose is a permitted dose.

The disclosure also describes a number sleeve for a drug deliverydevice, and a drug delivery device including the number sleeve. Thenumber sleeve is provided with different characteristics at differentlocations, where locations corresponding to a dose in a specific doserange, corresponding to permitted doses, have a first characteristic andlocations corresponding to a dose that are not in the permitted doserange have a second characteristic. These characteristics allow asupplementary device to sense from the drug administration devicewhether the dialled dose is a permitted dose even if the supplementarydevice does not have any pre-existing information about which doses arepermitted for the user. These characteristics also allow a user easilyto see from the injection device 1, when the supplementary device 2 isnot in place (e.g. when not in use), whether the currently set ordialled dose is permitted. In some embodiments, locations correspondingto a dose which is permitted indicate the dose as a number that iscoloured black on a white background, and locations corresponding to adose that is not permitted are indicated by a number that is colouredwhite on a black background.

In the following, embodiments of the present disclosure will bedescribed with reference to an insulin injection device. The presentdisclosure is however not limited to such application and may equallywell be deployed with injection devices that eject other medicaments, orwith other types of drug delivery device.

FIG. 1 is an exploded view of an injection device 1, which may forinstance represent Sanofi's Solostar (RTM) insulin injection pen. Moregenerally, it is a pen-type injector device.

The injection device 1 of FIG. 1 is a pre-filled, disposable injectionpen that comprises a housing 10 and contains an insulin container 14, towhich a needle 15 can be affixed. The needle is protected by an innerneedle cap 16 and an outer needle cap 17, which in turn can be coveredby a cap 18. An insulin dose to be ejected from injection device 1 canbe selected by turning the dosage knob 12, and the selected dose is thendisplayed via dosage window 13, for instance in multiples of so-calledInternational Units (IU), wherein one IU is the biological equivalent ofabout 45.5 micrograms of pure crystalline insulin (1/22 mg). An exampleof a selected dose displayed in dosage window 13 may for instance be 30IUs, as shown in FIG. 1. It should be noted that the selected dose mayequally well be displayed differently. A label (not shown) is providedon the housing 10. The label includes information about the drugincluded within the injection device, including information identifyingthe medicament. The information identifying the drug may be in the formof text. The information identifying the drug may also be in the form ofa colour. The information identifying the drug may also be encoded intoa barcode, QR code or the like. The information identifying the drug mayalso be in the form of a black and white pattern, a colour pattern orshading.

Turning the dosage knob 12 causes a mechanical click sound to provideacoustical feedback to a user. The numbers displayed in dosage window13, in the sense that they are visible through the dosage window 13, arepresent on a number sleeve 19. The numbers are for instance provided onthe number sleeve 19 by printing. As can be seen best from FIGS. 7 and8, the numbers are provided in a continuous sequence on the numbersleeve 19. Individual numbers (including numbers formed from twocharacters) are formed at consecutive locations in the shape of a helixaround a generally cylindrical outer surface of the number sleeve 19.

The number sleeve 19 is contained in housing 10 and mechanicallyinteracts with a piston in insulin container 14. When needle 15 is stuckinto a skin portion of a patient, and then injection button 11 ispushed, the insulin dose displayed in display window 13 will be ejectedfrom injection device 1. When the needle 15 of injection device 1remains for a certain time in the skin portion after the injectionbutton 11 is pushed, a high percentage of the dose is actually injectedinto the patient's body. Ejection of the insulin dose also causes amechanical click sound, which is however different from the soundsproduced when using dosage knob 12.

Injection device 1 may be used for several injection processes untileither insulin container 14 is empty or the expiration date of injectiondevice 1 (e.g. 28 days after the first use) is reached.

Furthermore, before using injection device 1 for the first time, it maybe necessary to perform a so-called “prime shot” to remove air frominsulin container 14 and needle 15, for instance by selecting two unitsof insulin and pressing injection button 11 while holding injectiondevice 1 with the needle 15 upwards.

For simplicity of presentation, in the following, it will be exemplarilyassumed that the ejected doses substantially correspond to the injecteddoses, so that, for instance when making a proposal for a dose to beinjected next, this dose equals the dose that has to ejected by theinjection device. Nevertheless, differences (e.g. losses) between theejected doses and the injected doses may of course be taken intoaccount.

FIG. 1b is a close-up of the end of the injection device 1. This Fig.shows a locating rib 70 that is located between the viewing window 13and the dosage knob 12.

FIG. 2a is a schematic illustration of an embodiment of a supplementarydevice 2 to be releasably attached to injection device 1 of FIG. 1.Supplementary device 2 comprises a housing 20 with a mating unit orattachment mechanism configured and embrace the housing 10 of injectiondevice 1 of FIG. 1, so that supplementary device 2 sits tightly onhousing 10 of injection device 1, but is nevertheless removable frominjection device 1, for instance when injection device 1 is empty andhas to be replaced. FIG. 2a is highly schematic, and details of thephysical arrangement are described below with reference to FIG. 2 b.

Supplementary device 2 contains optical and acoustical sensors forgathering information from injection device 1. At least a part of thisinformation, for instance a selected dose (and optionally a unit of thisdose), is displayed via display unit 21 of supplementary device 2. Thedosage window 13 of injection device 1 is obstructed by supplementarydevice 2 when attached to injection device 1.

Supplementary device 2 further comprises at least one user inputtransducer, illustrated schematically as a button 22. These inputtransducers 22 allow a user to turn on/off supplementary device 2, totrigger actions (for instance to cause establishment of a connection toor a pairing with another device, and/or to trigger transmission ofinformation from supplementary device 2 to another device), or toconfirm something.

FIG. 2b is a schematic illustration of a second embodiment of asupplementary device 2 to be releasably attached to injection device 1of FIG. 1. Supplementary device 2 comprises a housing 20 with a matingunit configured and embrace the housing 10 of injection device 1 of FIG.1, so that supplementary device 2 sits tightly on housing 10 ofinjection device 1, but is nevertheless removable from injection device1.

Information is displayed via display unit 21 of supplementary device 2.The dosage window 13 of injection device 1 is obstructed bysupplementary device 2 when attached to injection device 1.

Supplementary device 2 further comprises three user input buttons orswitches. A first button 22 is a power on/off button, via which thesupplementary device 2 may for instance be turned on and off. A secondbutton 33 is a communications button. A third button 34 is a confirm orOK button. The buttons 22, 33, 34 may be any suitable form of mechanicalswitch. These input buttons 22, 33, 34 allow a user to turn on/offsupplementary device 2, to trigger actions (for instance to causeestablishment of a connection to or a pairing with another device,and/or to trigger transmission of information from supplementary device2 to another device), or to confirm something.

FIG. 2c is a schematic illustration of a third embodiment of asupplementary device 2 to be releasably attached to injection device 1of FIG. 1. Supplementary device 2 comprises a housing 20 with a matingunit configured to embrace the housing 10 of injection device 1 of FIG.1, so that supplementary device 2 sits tightly on housing 10 ofinjection device 1, but is nevertheless removable from injection device1.

Information is displayed via display unit 21 of the supplementary device2. The dosage window 13 of injection device 1 is obstructed bysupplementary device 2 when attached to injection device 1.

Supplementary device 2 further comprises a touch-sensitive inputtransducer 35. It also comprises a single user input button or switch22. The button 22 is a power on/off button, via which the supplementarydevice 2 may for instance be turned on and off. The touch sensitiveinput transducer 35 can be used to trigger actions (for instance tocause establishment of a connection to or a pairing with another device,and/or to trigger transmission of information from supplementary device2 to another device), or to confirm something.

FIG. 3 shows a schematic view of the supplementary device 2 of FIG. 2ain a state where it is attached to injection device 1 of FIG. 1.

With the housing 20 of supplementary device 2, a plurality of componentsare contained. These are controlled by a processor 24, which may forinstance be a microprocessor, a Digital Signal Processor (DSP),Application Specific Integrated Circuit (ASIC), Field Programmable GateArray (FPGA) or the like. Processor 24 executes program code (e.g.software or firmware) stored in a program memory 240, and uses a mainmemory 241, for instance to store intermediate results. Main memory 241may also be used to store a logbook on performed ejections/injections.Program memory 240 may for instance be a Read-Only Memory (ROM), andmain memory may for instance be a Random Access Memory (RAM).

In embodiments such as those shown in FIG. 2b , processor 24 interactswith a first button 22, via which supplementary device 2 may forinstance be turned on and off. A second button 33 is a communicationsbutton. The second button may be used to trigger establishment of aconnection to another device, or to trigger a transmission ofinformation to another device. A third button 34 is a confirm or OKbutton. The third button 34 can be used to acknowledge informationpresented to a user of supplementary device 2. In embodiments such asthose shown in FIG. 2c , two of the buttons 33, 34 may be omitted.Instead, one or more capacitive sensors or other touch sensors areprovided.

Processor 24 controls a display unit 21, which is presently embodied asa Liquid Crystal Display (LCD). Display unit 21 is used to displayinformation to a user of supplementary device 2, for instance on presentsettings of injection device 1, or on a next injection to be given.Display unit 21 may also be embodied as a touch-screen display, forinstance to receive user input.

Processor 24 also controls an optical sensor 25, embodied as an OpticalCharacter Recognition (OCR) reader, that is capable of capturing imagesof the dosage window 13, in which a currently selected dose isdisplayed. The dose is displayed by way of numbers present on the numbersleeve 19 contained in injection device 1, which numbers are visiblethrough the dosage window 13. Optical sensor/OCR reader 25 is furthercapable of recognizing characters (e.g. numbers) from the captured imageand to provide this information to processor 24. In this case, theoptical sensor/OCR reader 25 includes a processor arrangement that isprogrammed by software stored in memory to be configured to performoptical character recognition. Alternatively, unit 25 in supplementarydevice 2 may only be an optical sensor, e.g. a camera, for capturingimages and providing information on the captured images to processor 24.Then processor 24 provides the function of performing OCR on thecaptured images.

The optical sensor 25 or the processor 24 provides the function also ofdetecting whether characteristics of the number sleeve 19 at thelocation being viewed by the optical sensor indicate whether or not theset or dialled dose is permitted.

Processor 24 also controls light-sources such as light emitting diodes(LEDs) 29 to illuminate the dosage window 13, in which a currentlyselected dose is displayed. A diffuser may be used in front of thelight-sources, for instance a diffuser made from a piece of acrylicglass. Furthermore, the optical sensor may comprise a lens system, forinstance including two aspheric lenses. The magnification ratio (imagesize to object size ratio) may be smaller than 1. The magnificationratio may be in the range of 0.05 to 0.5. In one embodiment themagnification ration may be 0.15.

Processor 24 further controls a photometer 26, that is configured todetermine an optical property of the housing 10 of injection device 1,for example a colour or a shading. The optical property may only bepresent in a specific portion of housing 10, for example an insulincontainer comprised within injection device 1, which colour or colourcoding may for instance be visible through a further window in housing10 (and/or in number sleeve 19). Information on this colour is thenprovided to processor 24, which may then determine the type of injectiondevice 1 or the type of insulin contained in injection device 1 (e.g.SoloStar Lantus with purple colour and SoloStar Apidra with bluecolour). Alternatively, a camera unit may be used instead of photometer26, and an image of the housing or insulin container may then beprovided to processor 24 to determine the colour of the housing orinsulin container by way of image processing. Further, one or more lightsources may be provided to improve reading of photometer 26. The lightsource may provide light of a certain wavelength or spectrum to improvecolour detection by photometer 26. The light source may be arranged insuch a way that unwanted reflections, for example by dosage window 13,are avoided or reduced.

Processor 24 further controls (and/or receives signals from) an acousticsensor 27, which is configured to sense sounds produced by injectiondevice 1. Such sounds may for instance occur when a dose is dialled byturning dosage knob 12 and/or when a dose is ejected/injected bypressing injection button 11, and/or when a prime shot is performed.These actions are mechanically similar but nevertheless sounddifferently (this may also be the case for electronic sounds thatindicate these actions). Either the acoustic sensor 27 and/or processor24 may be configured to differentiate these different sounds, forinstance to be able to safely recognize that an injection has takenplace (rather than a prime shot only).

Processor 24 further controls an acoustical signal generator 23, whichis configured to produce acoustical signals that may for instance berelated to the operating status of injection device 1, for instance asfeedback to the user. For example, an acoustical signal may be launchedby acoustical signal generator 23 as a reminder for the next dose to beinjected or as a warning signal, for instance in case of misuse.Acoustical signal generator may for instance be embodied as a buzzer orloudspeaker. In addition to or as an alternative to acoustical signalgenerator 23, also a haptic signal generator (not shown) may be used toprovide haptic feedback, for instance by way of vibration.

Processor 24 controls a wireless unit 28, which is configured totransmit and/or receive information to/from another device in a wirelessfashion. Such transmission may for instance be based on radiotransmission or optical transmission. In some embodiments, the wirelessunit 28 is a Bluetooth transceiver. Alternatively, wireless unit 28 maybe substituted or complemented by a wired unit configured to transmitand/or receive information to/from another device in a wire-boundfashion, for instance via a cable or fibre connection. When data istransmitted, the units of the data (values) transferred may beexplicitly or implicitly defined. For instance, in case of an insulindose, always International Units (IU) may be used, or otherwise, theused unit may be transferred explicitly, for instance in coded form.

Processor 24 receives an input from a pen detection switch 30, which isoperable to detect whether the pen 1 is present, i.e. to detect whetherthe supplementary device 2 is coupled to the injection device 1. Abattery 32 powers the processor 24 and other components by way of apower supply 31.

The supplementary device 2 of FIG. 3 is thus capable of determininginformation related to a condition and/or use of injection device 1.This information is displayed on the display 21 for use by the user ofthe device. The information may be either processed by supplementarydevice 2 itself, or may at least partially be provided to another device(e.g. a blood glucose monitoring system).

FIG. 4 is a flow chart illustrating operation of the supplementarydevice 2. It will be appreciated that FIG. 4 is schematic, and omitsmany of the low level details of operation of the supplementary device.

The operation starts at step 401. At step 402, the supplementary device2 detects the dose that is dialled into, or set in (these terms are usedinterchangeably), the injection device 1. The dialled dose is detectedby performing optical character recognition on the image that isprovided by the optical sensor 25, which is directed to read the numbersleeve 19 of the injection device 1 at the location of the dosage window13, as described above. Initially, the dialled dose typically is 0,before the user operates the injection device 1. Following step 402, thedialled dose is displayed in step 403 on the display 21. In this way,the user is able to determine the dose that is dialled into theinjection device 1 even though they are unable to view directly thenumber sleeve 19 through the dosage window 13.

At step 404, the supplementary device detects characteristics of thenumber sleeve 19. The characteristic detected at step 404 are not thenumbers that are present on the number sleeve 19, but are some othercharacteristics.

The number sleeve 19 of the injection device 1 is provided withdifferent characteristics at different locations, where locationscorresponding to a dose that is permitted have a first characteristicand locations corresponding to a dose that are not permitted have asecond characteristic. In some embodiments, as shown in FIGS. 5A, 5B, 6,7 and 8, locations corresponding to a dose which is in a permitted rangeof doses indicate the dose as a number that is coloured black on a whitebackground, and locations corresponding to a dose that is not permittedare indicated by a number that is coloured white on a black background.These characteristics allow a user easily to see from the injectiondevice 1, when the supplementary device 2 is not in place, whether thecurrently set or dialled dose is permitted.

In the FIGS. 5A and 5B injection device 1, the number sleeve 19 ismarked to indicate that doses of 30 and higher are permitted. The wholeof the number sleeve 19 of this injection device 1 is shown in FIG. 7.

As can be seen in particular from FIG. 7, locations corresponding todoses of 30 and above indicate the dose as a number that is colouredblack on a white background. Locations corresponding to doses between 0and 29 are indicated by a number that is coloured white on a blackbackground.

In the FIG. 6 injection device 1, the number sleeve 19 is marked toindicate that doses of 10 and higher value are permitted. The whole ofthe number sleeve 19 of this injection device 1 is shown in FIG. 8.

As can be seen in particular from FIG. 8, locations corresponding todoses of 10 and above indicate the dose as a number that is colouredblack on a white background.

Locations corresponding to doses between 0 and 9 are indicated by anumber that is coloured white on a black background.

In addition to the colour scheme described above, the number sleeve 19is marked to indicate that doses of 30 and higher value are permitted bythe size of the numbers, i.e. the font size. The feature of font sizecan be used in combination with the colour scheme feature, as can beseen in FIG. 8 for example. However, it is immanently clear to theskilled person that each feature—font size, colour scheme—can also beused alone, i.e. independently of the other.

When the supplementary device 2 is installed on the injection device 1,the user is unable to see the number sleeve 19, or at least is unable tosee the part of the number sleeve that is coincident with the dosagewindow 13. However, the supplementary device 2 is able to detect thecharacteristics of the number sleeve 19 by examining the output of theoptical sensor/OCR 25. The determination of the characteristics may beperformed as part of the processing of the optical sensor/OCR 25 outputwhen performing optical character recognition, or it may be performed asa separate step.

After the characteristics of the number sleeve 19 at the locationcurrently being viewed by the optical sensor 25 have been detected, atstep 405 it is determined by supplementary device 2 whether thecharacteristics indicate that the currently set dose is permitted. Inthe event that step 405 provides a negative response, because the numberon the number sleeve 19 is provided in the colour white on a blackbackground, the operation proceeds to step 406. Here, the supplementarydevice 406 indicates that the currently set dose is not permitted. Theindication may be provided in one of a number of manners which aredescribed below.

After step 406, the operation returns to step 402. Here, the dialleddose is again detected, before the dose is then displayed at step 403.Afterwards, the characteristics of the number sleeve 19 are againdetected at step 404 and a determination as to whether thecharacteristics indicate that the dose is permitted is performed at step405. This loop continues until it is detected at step 405 that the doseis permitted, when the operation proceeds to step 407. In this way, theuser is continually provided with an indication that the dose is notpermitted until such time that the supplementary device 2 determinesthat the currently set dose is permitted.

At step 407, the supplementary device 2 indicates to the user that thedose that is set in the injection device 1 is permitted. Indication maybe provided, for instance, by way of a suitable message on the display21. The indication may be by way of refraining from providing anindication that the dose is not permitted. In particular, if thecurrently dialled dose is not permitted, a warning message may beprovided, with the warning message being removed once the supplementarydevice 2 detects that the currently set dose is permitted. Theindication may be instead provided by an LED or other small opticaloutput transducer. The indication may for instance be in the form of agreen light.

After step 407, the supplementary device 2 determines that step 408whether the dose is being delivered. This determination may be made inany suitable way, as is known in the art. On a positive determination,the operation proceeds at step 409, where it is determined whether thedose has been delivered. This may be performed in any suitable way, asis known in the art. The operation remains at step 409 until it isdetermined that the dose has been delivered, when the operation proceedsto step 410.

At step 401, the delivered dose is calculated and displayed on thedisplay 21. This may be performed in any suitable way, as is known inthe art. The calculation of the delivered dose may involve subtractingthe dose that was set into the injection device 1, following dosedelivery from the dose that was set in the injection 1 before dosedelivery. If all of the set dose was delivered, then the remaining doseis 0 and the delivered dose is equal to the set dose.

Following step 410, the operation ends at step 411.

If at step 408, the supplementary device 2 determines that the dose isnot being delivered, the operation returns to step 402, where thedialled dose is again detected. This loop ensures that the dialled doseis detected and displayed up until the dose is delivered. It alsoensures that the supplementary device 2 either indicates at step 406that the dose is not permitted or indicates that step 407 that the doseis permitted, based on the detected characteristics of the number sleeve19, up until the dose is delivered. This occurs regardless of the valueof the dose that is set in the injection device 1. Indeed, thesupplementary device 2 does not need to be aware of the range of dosesthat are permitted by the injection device 1. Instead, the supplementarydevice 2 only needs to determine the characteristics of the numbersleeve 19 at the location that is being viewed by the optical sensor 25in order to determine whether the dose is permitted.

In the above, the detection as to whether a dose is permitted is carriedout by detecting whether the numbers on the number sleeve 19 areprovided in white-on-black or in black-on-white. In other embodiments,the determination is made based on some other characteristic of thenumbers on the number sleeve 19. For instance, the numbers on the numbersleeve 19 indicates doses in the range that is permitted may have adifferent colour to numbers in the range that is not permitted but thebackground remains the same colour in both cases. For instance, thebackground of the number sleeve 19 may be white for the entire range ofdoses that can be delivered by the injection device 1, and the numbersare provided in a first colour (for instance grey or black) when thenumber relates to a dose that is permitted and in a different colour(for instance red or orange) when the number relates to a dose that isnot permitted. In this case, step 404 of FIG. 4 involves thesupplementary device to detecting from signals provided by the opticalsensor 25 what colour are the numbers on the number sleeve 19 and/orwhat colour is the background at the location currently being viewed bythe optical sensor 25. Colour determination may be in terms solely ofwhether the numbers are relatively light or relatively dark in colour,and/or whether the background is relatively light or relatively dark incolour.

In some embodiments, the colour of the numbers is the same for allnumbers on the number sleeve 19, but the colour of the background of thenumber sleeve 19 changes depending on whether the number at theparticular location relates to a dose that is permitted. For instance,the numbers on the number sleeve 19 may be a first colour (for instancegrey or black) for all values, and the background may be a first colour(e.g. yellow or white) for values of a dose that are permitted and asecond colour (e.g. orange or red) for dose values that are notpermitted. In this case, the detection of the characteristics of thenumber sleeve 19 at step 404 involves detecting a background colour ofthe number sleeve 19 and step 405 involves determining whether thebackground colour indicates whether the dose is permitted. Having a redor orange colour as the colour of the background of the number sleeve 19for doses that are not permitted means that the user can easilydetermine from examination of the number sleeve 19 of the injectiondevice when the supplementary device 2 is not installed whether thecurrently set does is a permitted dose.

In some embodiments, the background of the number sleeve 19 is providedwith a pattern, for instance a striped pattern, at locationscorresponding to a dose that is not permitted and is provided with anun-patterned background at locations corresponding to a dose that ispermitted. In some embodiments, the converse is true, so that apatterned background is provided at locations corresponding to dosesthat are permitted.

In some embodiments, the characteristics of the number sleeve 19 aredifferent at different locations in a way that is detectable by theoptical detector 25 but that is not detectable by human users. Forinstance, the number sleeve 19 is provided with a marking that isvisible in ultraviolet or infrared. Either the marking is different atlocations on a number sleeve 19 corresponding to doses that arepermitted compared to the markings that locations on the number sleeve19 where doses are not permitted, or vice versa. With these embodiments,supplementary device 2 is able to determine from processing of signalsprovided by the optical sensor whether a dose that is currently set ispermitted, but a user viewing the injection device 1 when thesupplementary device is not installed would not be able to determinefrom characteristics of the number sleeve 19 whether the currently setdose was permitted.

The indication that the dose is not permitted that is provided at step406 may be provided on the display 21, or it may be provided in someother way. As regards the display 21, the indication may be provided asa message that is displayed on the display 21. The message may take theform “dose not permitted”, or some other suitable form. The indicationmay be provided continually. For instance, one part of the display maybe used to include the indication that the dose is not permitted andanother part of the display may be used to indicate the set dose.Alternatively, the indication may be provided intermittently, forinstance, the display 21 may be caused to alternate between displayingthe dialled dose and displaying a message that the dose is notpermitted.

Alternatively, the indication may be by way of a separate transducer,for instance an LED or other small optical transducer. The indicationthat the dose is not permitted may be of a colour that is traditionallyassociated with ‘stop’, or an alert, for instance, the colour red or thecolour orange. For instance, the indication may be made by way of asmall red LED or other red optical transducer.

Alternatively or in addition, the indication may be made acoustically,for instance by way of a buzzer. Alternatively, the indication may bemade haptically. In some embodiments, the supplementary device 2 isconfigured to monitor whether the characteristics of the number sleeve19 that indicate that the doses permitted have been detected after theoperation starts at step 401. In these embodiments, the supplementarydevice 2 is configured to indicate, for instance on the display 21,whether the user needs to increase or decrease the currently dialleddose in order to reach a dose that is permitted. After starting, thedialled dose is smaller than the lower limit of the range of doses thatis permitted. As such, until the supplementary device 2 detects that thecharacteristics of the number sleeve 19 viewed by the optical sensor 25indicate that the currently dialled dose is permitted, the supplementarydevice 2 indicates to the user that the dose needs to be increased. Thiscan occur for example by providing an arrow pointing upwards on thedisplay 21. It can occur alternatively by providing a message “increasedose” on the display 21. Such a message also constitutes an indicationthat the currently dialled dose is not permitted.

When the currently dialled dose is a permitted dose, no indications thatthe dose is not permitted are provided. If the user operates theinjection device 1 such that the currently dialled dose exceeds theupper limit of the range that is permitted, as detected by thesupplementary device from the characteristics of the number sleeve 19 atstep 404, the supplementary device 2 may indicate to the user that thedialled dose needs to be reduced. This can occur for instance by causingdisplay on the display 21 of a downwardly pointing arrow or a messagestating “decrease dose”, or such like.

It will be appreciated that the supplementary device 2 does not need tobe provided with information indicating the range of doses that arepermitted in order to provide this function. Instead, the supplementarydevice 2 can determine whether to provide an increase dose message or adecrease dose message firstly by determining whether the currentlydialled dose has yet given rise to detecting characteristics of thenumber sleeve 19 indicating that the dose is permitted, and after thecharacteristics indicate that the dose is permitted by responding todetection that the characteristics of the number sleeve 19 indicate thatthe dose is not permitted by determining whether the dialled dose hasincreased or decreased since the dose dialled at the time when thecharacteristics on the number sleeve 19 were detected to indicate thatthe dose is permitted.

In some embodiments, the supplementary device 2 is configured such thatit is unable to detect the dose except when the characteristics indicatethat the dose is permitted. For instance, the OCR function of theoptical sensor 25 may be configured such that it is unable to performoptical character recognition of white numbers on a black background,and so be unable to read a number indicating the dialled dose until theuser has operated the injection device 1 such that the dialled dose ispermitted and thus that the dialled dose can be coded by the opticalsensor 25. In these embodiments, the currently dialled dose is displayedonly when the currently dialled dose is a permitted dose. In theseembodiments, the indication that the dose is not permitted that isprovided at step 406 may simply be the absence of a displayed dialleddose.

In other embodiments (not shown in the Figures), a number sleeve isprovided with a permitted dose range sandwiched between non-permitteddose ranges. For instance, the surface of the number sleeve at locationscorresponding to doses of 30, 60 and all values in between indicate thedose as a number that is coloured black on a white background. Thesurface of the number sleeve at locations corresponding to doses between0 and 29 and from 61 upwards are indicated by a number that is colouredwhite on a black background. In another example, the number sleeve 19 ismarked to indicate that doses of between 10 and a higher value (e.g. 20or 40) are permitted. In particular, locations corresponding to doses of10, 20 and all values in between indicate the dose as a number that iscoloured black on a white background. Locations corresponding to dosesbetween 0 and 9 and from 21 (or 41) upwards are indicated by a numberthat is coloured white on a black background.

In still further embodiments, the supplementary device 2 is operablewith a number sleeve 19 that is provided with numbers only at locationscorresponding to doses that are permitted. For instance, the numbersleeve 19 may be provided with numbers at locations corresponding todose values 10, 12, 14, 16, 18 and 20. Alternatively, the number sleeve19 may be provided with numbers at locations corresponding to dosevalues 10, 15 and 20. In all these embodiments, the number sleeve 19 isprovided with numbers that do not constitute a continuous series of dosevalues but instead are members of a discontinuous series. Here, thesupplementary device 2 is configured such that it is unable to detectthe dose except when the characteristics indicate that the dose ispermitted. Here, unless a quantity of currently set dose of drug isdetermined, an indication that the currently set dose of drug is not apermitted dose is caused to be provided.

With these embodiments in which the dose is readable by thesupplementary device 2 only at locations corresponding to a permitteddose, the user is able to determine accurately the dialled dose only ifthe dialled dose is within the permitted range or if the supplementarydevice 2 is not installed on the injection device 1.

In addition to providing an indication that the dialled dose is not apermitted dose, the supplementary device 2 may prevent dose deliverywhilst the dialled dose is not a permitted dose. This may for example beachieved with a locking mechanism as described in WO 2013/076026 A1.Some other suitable locking mechanism may be used instead.

The terms “drug” or “medicament” which are used interchangeably herein,mean a pharmaceutical formulation that includes at least onepharmaceutically active compound.

The term “drug delivery device” shall be understood to encompass anytype of device, system or apparatus designed to immediately dispense adrug to a human or non-human body (veterinary applications are clearlycontemplated by the present disclosure). By “immediately dispense” ismeant an absence of any necessary intermediate manipulation of the drugby a user between discharge of the drug from the drug delivery deviceand administration to the human or non-human body. Without limitation,typical examples of drug delivery devices may be found in injectiondevices, inhalers, and stomach tube feeding systems. Again withoutlimitation, exemplary injection devices may include, e.g., syringes,autoinjectors, injection pen devices and spinal injection systems.

Those of skill in the art will understand that modifications (additionsand/or removals) of various components of the substances, formulations,apparatuses, methods, systems and embodiments described herein may bemade without departing from the full scope and spirit of the presentdisclosure, which encompass such modifications and any and allequivalents thereof.

The terms “drug” or “medicament” are used herein to describe one or morepharmaceutically active compounds. As described below, a drug ormedicament can include at least one small or large molecule, orcombinations thereof, in various types of formulations, for thetreatment of one or more diseases. Exemplary pharmaceutically activecompounds may include small molecules; polypeptides, peptides andproteins (e.g., hormones, growth factors, antibodies, antibodyfragments, and enzymes); carbohydrates and polysaccharides; and nucleicacids, double or single stranded DNA (including naked and cDNA), RNA,antisense nucleic acids such as antisense DNA and RNA, small interferingRNA (siRNA), ribozymes, genes, and oligonucleotides. Nucleic acids maybe incorporated into molecular delivery systems such as vectors,plasmids, or liposomes. Mixtures of one or more of these drugs are alsocontemplated.

The term “drug delivery device” shall encompass any type of device orsystem configured to dispense a drug into a human or animal body.Without limitation, a drug delivery device may be an injection device(e.g., syringe, pen injector, auto injector, large-volume device, pump,perfusion system, or other device configured for intraocular,subcutaneous, intramuscular, or intravascular delivery), skin patch(e.g., osmotic, chemical, micro-needle), inhaler (e.g., nasal orpulmonary), implantable (e.g., coated stent, capsule), or feedingsystems for the gastro-intestinal tract. The presently described drugsmay be particularly useful with injection devices that include a needle,e.g., a small gauge needle.

The drug or medicament may be contained in a primary package or “drugcontainer” adapted for use with a drug delivery device. The drugcontainer may be, e.g., a cartridge, syringe, reservoir, or other vesselconfigured to provide a suitable chamber for storage (e.g., short- orlong-term storage) of one or more pharmaceutically active compounds. Forexample, in some instances, the chamber may be designed to store a drugfor at least one day (e.g., 1 to at least 30 days). In some instances,the chamber may be designed to store a drug for about 1 month to about 2years. Storage may occur at room temperature (e.g., about 20° C.), orrefrigerated temperatures (e.g., from about −4° C. to about 4° C.). Insome instances, the drug container may be or may include a dual-chambercartridge configured to store two or more components of a drugformulation (e.g., a drug and a diluent, or two different types ofdrugs) separately, one in each chamber. In such instances, the twochambers of the dual-chamber cartridge may be configured to allow mixingbetween the two or more components of the drug or medicament prior toand/or during dispensing into the human or animal body. For example, thetwo chambers may be configured such that they are in fluid communicationwith each other (e.g., by way of a conduit between the two chambers) andallow mixing of the two components when desired by a user prior todispensing. Alternatively or in addition, the two chambers may beconfigured to allow mixing as the components are being dispensed intothe human or animal body.

The drug delivery devices and drugs described herein can be used for thetreatment and/or prophylaxis of many different types of disorders.Exemplary disorders include, e.g., diabetes mellitus or complicationsassociated with diabetes mellitus such as diabetic retinopathy,thromboembolism disorders such as deep vein or pulmonarythromboembolism. Further exemplary disorders are acute coronary syndrome(ACS), angina, myocardial infarction, cancer, macular degeneration,inflammation, hay fever, atherosclerosis and/or rheumatoid arthritis.

Exemplary drugs for the treatment and/or prophylaxis of diabetesmellitus or complications associated with diabetes mellitus include aninsulin, e.g., human insulin, or a human insulin analogue or derivative,a glucagon-like peptide (GLP-1), GLP-1 analogues or GLP-1 receptoragonists, or an analogue or derivative thereof, a dipeptidyl peptidase-4(DPP4) inhibitor, or a pharmaceutically acceptable salt or solvatethereof, or any mixture thereof. As used herein, the term “derivative”refers to any substance which is sufficiently structurally similar tothe original substance so as to have substantially similar functionalityor activity (e.g., therapeutic effectiveness).

Exemplary insulin analogues are Gly(A21), Arg(B31), Arg(B32) humaninsulin (insulin glargine); Lys(B3), Glu(B29) human insulin; Lys(B28),Pro(B29) human insulin; Asp(B28) human insulin; human insulin, whereinproline in position B28 is replaced by Asp, Lys, Leu, Val or Ala andwherein in position B29 Lys may be replaced by Pro; Ala(B26) humaninsulin; Des(B28-B30) human insulin; Des(B27) human insulin and Des(B30)human insulin.

Exemplary insulin derivatives are, for example, B29-N-myristoyl-des(B30)human insulin; B29-N-palmitoyl-des(B30) human insulin; B29-N-myristoylhuman insulin; B29-N-palmitoyl human insulin; B28-N-myristoylLysB28ProB29 human insulin; B28-N-palmitoyl-LysB28ProB29 human insulin;B30-N-myristoyl-ThrB29LysB30 human insulin; B30-N-palmitoyl-ThrB29LysB30human insulin; B29-N—(N-palmitoyl-gamma-glutamyl)-des(B30) humaninsulin; B29-N—(N-lithocholyl-gamma-glutamyl)-des(B30) human insulin;B29-N-(ω-carboxyheptadecanoyl)-des(B30) human insulin andB29-N-(ω-carboxyhepta¬decanoyl) human insulin. Exemplary GLP-1, GLP-1analogues and GLP-1 receptor agonists are, for example:Lixisenatide/AVE0010/ZP10/Lyxumia,Exenatide/Exendin-4/Byetta/Bydureon/ITCA 650/AC-2993 (a 39 amino acidpeptide which is produced by the salivary glands of the Gila monster),Liraglutide/Victoza, Semaglutide, Taspoglutide, Syncria/Albiglutide,Dulaglutide, rExendin-4, CJC-1134-PC, PB-1023, TTP-054,Langlenatide/HM-11260C, CM-3, GLP-1 Eligen, ORMD-0901, NN-9924, NN-9926,NN-9927, Nodexen, Viador-GLP-1, CVX-096, ZYOG-1, ZYD-1, GSK-2374697,DA-3091, MAR-701, MAR709, ZP-2929, ZP-3022, TT-401, BHM-034. MOD-6030,CAM-2036, DA-15864, ARI-2651, ARI-2255, Exenatide-XTEN andGlucagon-Xten.

An exemplary oligonucleotide is, for example: mipomersen/Kynamro, acholesterol-reducing antisense therapeutic for the treatment of familialhypercholesterolemia.

Exemplary DPP4 inhibitors are Vildagliptin, Sitagliptin, Denagliptin,Saxagliptin, Berberine.

Exemplary hormones include hypophysis hormones or hypothalamus hormonesor regulatory active peptides and their antagonists, such asGonadotropine (Follitropin, Lutropin, Choriongonadotropin, Menotropin),Somatropine (Somatropin), Desmopressin, Terlipressin, Gonadorelin,Triptorelin, Leuprorelin, Buserelin, Nafarelin, and Goserelin.

Exemplary polysaccharides include a glucosaminoglycane, a hyaluronicacid, a heparin, a low molecular weight heparin or an ultra-lowmolecular weight heparin or a derivative thereof, or a sulphatedpolysaccharide, e.g. a poly-sulphated form of the above-mentionedpolysaccharides, and/or a pharmaceutically acceptable salt thereof. Anexample of a pharmaceutically acceptable salt of a poly-sulphated lowmolecular weight heparin is enoxaparin sodium. An example of ahyaluronic acid derivative is Hylan G-F 20/Synvisc, a sodiumhyaluronate.

The term “antibody”, as used herein, refers to an immunoglobulinmolecule or an antigen-binding portion thereof. Examples ofantigen-binding portions of immunoglobulin molecules include F(ab) andF(ab′)2 fragments, which retain the ability to bind antigen. Theantibody can be polyclonal, monoclonal, recombinant, chimeric,de-immunized or humanized, fully human, non-human, (e.g., murine), orsingle chain antibody. In some embodiments, the antibody has effectorfunction and can fix complement. In some embodiments, the antibody hasreduced or no ability to bind an Fc receptor. For example, the antibodycan be an isotype or subtype, an antibody fragment or mutant, which doesnot support binding to an Fc receptor, e.g., it has a mutagenized ordeleted Fc receptor binding region.

The terms “fragment” or “antibody fragment” refer to a polypeptidederived from an antibody polypeptide molecule (e.g., an antibody heavyand/or light chain polypeptide) that does not comprise a full-lengthantibody polypeptide, but that still comprises at least a portion of afull-length antibody polypeptide that is capable of binding to anantigen. Antibody fragments can comprise a cleaved portion of a fulllength antibody polypeptide, although the term is not limited to suchcleaved fragments. Antibody fragments that are useful in the presentdisclosure include, for example, Fab fragments, F(ab′)2 fragments, scFv(single-chain Fv) fragments, linear antibodies, monospecific ormultispecific antibody fragments such as bispecific, trispecific, andmultispecific antibodies (e.g., diabodies, triabodies, tetrabodies),minibodies, chelating recombinant antibodies, tribodies or bibodies,intrabodies, nanobodies, small modular immunopharmaceuticals (SMIP),binding-domain immunoglobulin fusion proteins, camelized antibodies, andVHH containing antibodies. Additional examples of antigen-bindingantibody fragments are known in the art.

The terms “Complementarity-determining region” or “CDR” refer to shortpolypeptide sequences within the variable region of both heavy and lightchain polypeptides that are primarily responsible for mediating specificantigen recognition. The term “framework region” refers to amino acidsequences within the variable region of both heavy and light chainpolypeptides that are not CDR sequences, and are primarily responsiblefor maintaining correct positioning of the CDR sequences to permitantigen binding. Although the framework regions themselves typically donot directly participate in antigen binding, as is known in the art,certain residues within the framework regions of certain antibodies candirectly participate in antigen binding or can affect the ability of oneor more amino acids in CDRs to interact with antigen.

Exemplary antibodies are anti PCSK-9 mAb (e.g., Alirocumab), anti IL-6mAb (e.g., Sarilumab), and anti IL-4 mAb (e.g., Dupilumab).

The compounds described herein may be used in pharmaceuticalformulations comprising (a) the compound(s) or pharmaceuticallyacceptable salts thereof, and (b) a pharmaceutically acceptable carrier.The compounds may also be used in pharmaceutical formulations thatinclude one or more other active pharmaceutical ingredients or inpharmaceutical formulations in which the present compound or apharmaceutically acceptable salt thereof is the only active ingredient.Accordingly, the pharmaceutical formulations of the present disclosureencompass any formulation made by admixing a compound described hereinand a pharmaceutically acceptable carrier.

Pharmaceutically acceptable salts of any drug described herein are alsocontemplated for use in drug delivery devices. Pharmaceuticallyacceptable salts are for example acid addition salts and basic salts.Acid addition salts are e.g. HCl or HBr salts. Basic salts are e.g.salts having a cation selected from an alkali or alkaline earth metal,e.g. Na+, or K+, or Ca2+, or an ammonium ion N+(R1)(R2)(R3)(R4), whereinR1 to R4 independently of each other mean: hydrogen, an optionallysubstituted C1 C6-alkyl group, an optionally substituted C2-C6-alkenylgroup, an optionally substituted C6-C10-aryl group, or an optionallysubstituted C6-C10-heteroaryl group. Further examples ofpharmaceutically acceptable salts are known to those of skill in thearts.

Pharmaceutically acceptable solvates are for example hydrates oralkanolates such as methanolates or ethanolates.

Those of skill in the art will understand that modifications (additionsand/or removals) of various components of the substances, formulations,apparatuses, methods, systems and embodiments described herein may bemade without departing from the full scope and spirit of the presentdisclosure, which encompass such modifications and any and allequivalents thereof.

1. A supplementary device for attachment to a drug delivery device, thesupplementary device comprising: an attachment mechanism for couplingthe supplementary device to the drug delivery device; an imagingarrangement configured to provide image data representing a capturedimage of one or more numbers present on a number sleeve of the drugdelivery device at a location on the number sleeve corresponding to acurrently set dose of medicament; and a processor arrangement configuredto: receive the image data representing the captured image; performoptical character recognition on the image data to determine a quantityof the currently set dose of medicament; cause display of the quantityof the currently set dose of medicament; process the image datarepresenting the captured image to identify one or more characteristicsof the number sleeve at the location; determine from the determinedcharacteristics of the number sleeve whether the currently set dose ofdrug is a permitted dose; and in response to determining that thecurrently set dose of drug is not a permitted dose, cause an indicationthat the currently set dose of drug is not a permitted dose to beprovided.
 2. A supplementary device as claimed in claim 1, wherein theprocessor arrangement is configured to process the image datarepresenting the captured image to identify one or more characteristicsof the number sleeve at the location by determining a colour of thebackground of the number sleeve at the location.
 3. A supplementarydevice as claimed in claim 1, wherein the processor arrangement isconfigured to process the image data representing the captured image toidentify one or more characteristics of the number sleeve at thelocation by determining a colour of the numbers on the number sleeve atthe location.
 4. A supplementary device as claimed in claim 1, whereinthe processor arrangement is configured to determine from the determinedcharacteristics of the number sleeve whether the currently set dose ofdrug is a permitted dose by determining whether the characteristics ofthe number sleeve at the location are light coloured numbers on a darkcoloured background.
 5. A supplementary device as claimed in claim 1,wherein the processor arrangement is configured to determine from thedetermined characteristics of the number sleeve whether the currentlyset dose of drug is a permitted dose by determining whether thecharacteristics of the number sleeve at the location are dark colourednumbers on a light coloured background.
 6. A supplementary device asclaimed in claim 1, wherein the processor arrangement is configured tocause the indication that the currently set dose of drug is not apermitted dose to be provided by causing display of a message.
 7. Asupplementary device as claimed in claim 1, wherein the processorarrangement is configured to cause the indication that the currently setdose of drug is not a permitted dose to be provided by causing displayof a message simultaneously with causing display of the quantity of thecurrently set dose of medicament.
 8. A supplementary device as claimedin claim 1, wherein the processor arrangement is configured to cause theindication that the currently set dose of drug is not a permitted doseto be provided by causing display of a message alternately with causingdisplay of the quantity of the currently set dose of medicament.
 9. Asupplementary device as claimed in claim 1, wherein the processorarrangement is configured to cause the indication that the currently setdose of drug is not a permitted dose to be provided by causingillumination of an LED or other optical transducer.
 10. A supplementarydevice as claimed in claim 1, wherein the processor arrangement isconfigured, in response to determining that the currently set dose ofdrug is not a permitted dose, to actuate a locking arrangement toprevent drug delivery.
 11. A system comprising: a drug delivery devicehaving a number sleeve with one or more numbers provided thereon asupplementary device for attachment to the drug delivery device, thesupplementary device comprising: an attachment mechanism for couplingthe supplementary device to the drug delivery device; an imagingarrangement configured to provide image data representing a capturedimage of the one or more numbers present on the number sleeve of thedrug delivery device at a location on the number sleeve corresponding toa currently set dose of medicament; and a processor arrangementconfigured to: receive the image data representing the captured image;perform optical character recognition on the image data to determine aquantity of the currently set dose of medicament; cause display of thequantity of the currently set dose of medicament; process the image datarepresenting the captured image to identify one or more characteristicsof the number sleeve at the location; determine from the determinedcharacteristics of the number sleeve whether the currently set dose ofdrug is a permitted dose; and in response to determining that thecurrently set dose of drug is not a permitted dose, cause an indicationthat the currently set dose of drug is not a permitted dose to beprovided.
 12. A number sleeve for a drug administration device, thenumber sleeve comprising a generally cylindrical outer surface on whichare provided a sequence of numbers arranged at different locations onthe surface with the sequence provided in a helix, each of the numbersrelating to a drug dose, where the surface at locations corresponding todoses within a specific dose range has different characteristics to thesurface at locations corresponding to doses that are outside of thespecific dose range.
 13. A number sleeve as claimed in claim 12, whereinthe different characteristics are different colours for the numbers onthe surface of the number sleeve.
 14. A number sleeve as claimed inclaim 12, wherein the different characteristics are different coloursfor a background to the numbers on the surface of the number sleeve. 15.A number sleeve as claimed in claim 13, wherein the different coloursare detectable by the human eye.
 16. A number sleeve as claimed in claim12, wherein the surface at locations corresponding to doses within thespecific range indicate the dose as a number that is coloured black on awhite background, and the surface at locations corresponding to dosesoutside the specific range indicate the dose as a number that iscoloured white on a black background.
 17. A drug delivery deviceincluding the number sleeve of claim
 15. 18. A system as claimed inclaim 11, wherein the processor arrangement is configured to process theimage data representing the captured image to identify one or morecharacteristics of the number sleeve at the location by determining acolour of the background of the number sleeve at the location.
 19. A asclaims in claim 11, wherein the processor arrangement is configured toprocess the image data representing the captured image to identify oneor more characteristics of the number sleeve at the location bydetermining a colour of the numbers on the number sleeve at thelocation.
 20. A system as claimed in claim 11, wherein the processorarrangement is configured to determine from the determinedcharacteristics of the number sleeve whether the currently set dose ofdrug is a permitted dose by determining whether the characteristics ofthe number sleeve at the location are light coloured numbers on a darkcoloured background.